Taiwan Semiconductor Corporation S2AHR5G

Overview

S2AHR5G from Taiwan Semiconductor is a 2 A, 50 V standard surface-mount silicon rectifier diode in DO-214AA (SMB) package, featuring glass-passivated junction, 1.15 V max forward voltage at 2 A, 50 A surge capability, and 150 °C max junction temperature - used in AC/DC front-end rectification for compact SMPS adapters.

For engineers reviewing the S2AHR5G datasheet, S2AHR5G pinout, S2AHR5G application, or S2AHR5G equivalent, key selection criteria include repetitive peak reverse voltage (50 V), forward current rating (2 A), thermal resistance (R_θJA = 53 °C/W), moisture sensitivity level (MSL 1), and RoHS/halogen-free compliance per IEC 61249-2-21.

Technical Context

The S2AHR5G is a single-die, unidirectional standard recovery rectifier optimized for cost-sensitive, medium-power AC/DC conversion where fast recovery is not required. Its 1500 ns reverse recovery time (trr) and 30 pF junction capacitance reflect standard PN-junction behavior under 0.5 A forward / 1.0 A reverse test conditions.

Thermally, it uses a DO-214AA (SMB) package with matte tin-plated leads, achieving R_θJL = 16 °C/W and R_θJA = 53 °C/W, enabling reliable operation up to 150 °C junction temperature with appropriate PCB copper area.

Key Specifications

Pinout & Package

DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance; UL 94V-0 molding compound; weight ≈ 0.090 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar standard rectifier applications.

Compared with MUR220RLG and VS-2EYH01-M3/5AT, the S2AHR5G delivers optimal balance of cost, surge robustness (50 A), and thermal performance (R_θJA = 53 °C/W) for line-frequency rectification - making it preferred for adapters, LED drivers, and industrial AC/DC modules where ultrafast recovery is unnecessary.

Availability

S2AHR5G is available at Aetrix Electronics and suitable for AC/DC adapter rectification, LED driver input stages, and industrial power supply input circuits requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.

Supply support for S2AHR5G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in rectifiers, TVS diodes, MOSFETs, and bipolar transistors since 1979.

The S2AHR5G belongs to TSC's S2x standard rectifier family, designed specifically for high-volume, cost-optimized AC/DC front-end rectification in consumer, industrial, and lighting power supplies - emphasizing reliability, automated assembly compatibility, and regulatory compliance.

FAQ

What is the maximum junction temperature rating for the S2AHR5G?

The S2AHR5G has a maximum junction temperature (T_JMAX) of +150 °C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet. This rating enables reliable operation in enclosed power supplies and LED drivers when mounted on adequate copper area. Thermal design must ensure actual junction temperature remains below this limit under worst-case load and ambient conditions. The S2AHR5G's R_θJA of 53 °C/W guides heatsinking requirements.

Is the S2AHR5G suitable for use in a bridge rectifier configuration?

Yes, the S2AHR5G is commonly used in single-phase bridge rectifiers, with four units forming a full-wave configuration. Its DO-214AA (SMB) package, 2 A average current rating, and 50 A surge capability make it suitable for universal-input (85–264 VAC) applications. Polarity is clearly marked by a cathode band, ensuring correct orientation. The S2AHR5G's 50 V V_RRM provides sufficient margin for 35 V peak line voltage in 25 V RMS systems.

Does the S2AHR5G meet RoHS and halogen-free requirements?

Yes, the S2AHR5G is RoHS compliant per EU Directive 2011/65/EU and halogen-free per IEC 61249-2-21. These certifications are explicitly stated in the Taiwan Semiconductor product documentation and confirmed on authorized distributor listings. The device uses matte tin-plated leads and UL 94V-0 molding compound, supporting environmentally responsible manufacturing and end-of-life processing. Compliance applies to the S2AHR5G as shipped and tested.

What is the reverse recovery time (trr) of the S2AHR5G, and how does it affect circuit design?

The S2AHR5G has a reverse recovery time (trr) of 1500 ns, measured at I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This standard recovery characteristic makes it appropriate for line-frequency (50/60 Hz) and low-switching-frequency (<100 kHz) applications, but unsuitable for high-frequency SMPS where faster diodes reduce switching loss. Circuit design should avoid high-dv/dt nodes unless snubbers are added. The S2AHR5G's trr is consistent across its S2x family.

What packaging and moisture sensitivity level does the S2AHR5G have?

The S2AHR5G is supplied in DO-214AA (SMB) package, tape-and-reel format (3,000 pcs per reel), and carries Moisture Sensitivity Level (MSL) 1 per J-STD-020 - meaning it has unlimited floor life at ≤30 °C/60% RH and requires no baking prior to reflow soldering. Its matte tin-plated leads comply with J-STD-002 for solderability, and the package meets UL 94V-0 flammability rating. This simplifies SMT line integration for the S2AHR5G.